Calculate the reflection coefficient for light at an air-to-silver interface (μ1 = μ2 = μ0, ε1 = ε0, σ = 6 × 107(OHM · m)−1), at optical frequencies (ω = 4 × 1015/s).
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Calculate the reflection coefficient for light at an air-to-silver interface
(μ1 = μ2 = μ0, ε1 = ε0, σ = 6 × 107(OHM · m)−1), at optical frequencies (ω =
4 × 1015/s).
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- Consider Aluminum Oxide (Al2O3) is to be deposited as an antireflection coating (ARC) on a-Si solar cell. Calculate the Reflectance for 550 nm wavelength when a 50nm thick Al2O3 layer is deposited on Si. Given: Refractive index of Air = 1. Refractive index of Al2O3 = 1.77.Light shines through atomic hydrogen gas. It is seen that the gas absorbs light readily at a wavelength of 91.63 nm. What is the value of n of the level to which the hydrogen is being excited by the absorption of light of this wavelength? Assume that the most of the atoms in the gas are in the lowest level. (h = 6.626 x 10-34 j . s, c = 3.00 × 108 m/s, 1 eV = 1.60 x 1019 j, the Rydberg constant is R = 1.097 × 107 m-1) 11 14 O 21 O 16a) Calculate the range of wavelengths (in m) for X-rays given their frequency range is 30,000 to 3.0 ✕ 107 THz. smaller value? m larger value? m (b) Do the same for the visible light frequency range of 380 to 760 THz. smaller value? m larger value ? m
- Light with an energy flux of 25x 104 Wm-²fals on a perfectly reflecting surface at normal incidence. If the surface area is 15 cm², the average force exerted on the surface is: (1) 1.25x 10-6N 2.50 x 10-6 N (2 (3) 1.20x 10-6N (4) 3.0x 10-6 NA laser used in LASIK eye surgery produces 55 pulses per second. The wavelength is 220.0 nm (in air), and each pulse lasts 10.0 ps. The average power emitted by the laser is 120.0 mW and the beam diameter is 0.800 mm. How long (in centimeters) is a single pulse of the laser in air?Quartz is a uniaxial birefringent material with refractive indices no=1.5534 and ne=1.5443. It is desired to make a quarter-wave plate of quartz for use with a Sodium laser of wavelength λ0=589 nm. Calculate the minimum thickness of the plate.Give your answer in micrometers to 1 d.p.
- If the planes of a crystal are 3.50 Å (1 Å = 10-10 m = 1 Ångstrom unit) apart, (a) what wavelength of electromagnetic waves is needed so that the first strong interference maximum in the Bragg reflection occurs when the waves strike the planes at an angle of 22.0°, and in what part of the electromagnetic spectrum do these waves lie? (See Fig). (b) At what other angles will strong interference maxima occur?For calculations, take the typical frequency of visible light and aluminum conductivity ω = 4 x 1015 s-1 σ = 3.8 x 107 Ohm/mThe index of refraction of a glass rod is 1.48 at T = 20.0°C and varies linearly with temperature, with a coefficient of 2.50 x 10-5/C°. The coefficient of linear expansion of the glass is 5.00 x 10-6/C°. At 20.0°C the length of the rod is 3.00 cm. A Michelson interferometer has this glass rod in one arm, and the rod is being heated so that its temperature increases at a rate of 5.00 C°/min. The light source has wavelength λ = 589 nm, and the rod initially is at T = 20.0°C. How many fringes cross the field of view each minute?